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(Color online) Experimental setup for terahertz generation and Michelson interferometry.
Spectra of terahertz pulses obtained by Michelson interferometry. (a) Sample DB-77, pump at ; (b) sample DB-77, pump at ; (c) sample B10, pump at ; and (d) sample A10, pump at . The spectra are distorted by water vapor absorption (high-resolution transmission molecular absorption database water transmission spectrum for path is shown on top of each plot). Insets show original interferograms.
Terahertz tuning curve for the pump wavelength. Dashed curve—theoretical.
Optical-to-terahertz conversion efficiency as a function of peak pump intensity for samples DB-77 (central frequency , circles) and A3 (central frequency , triangles). The average pump beam sizes were (open circles), (closed circles), (triangles), and (crossed circles). The pump wavelengths were (open circles and triangles) and (filled and crossed circles). Dashed lines—linear fits.
Parameters of the QPM GaAs samples.
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